Basic blog structure (fix #3)

Ref: #3.

This also intruce swebtest.
This also adds TimestampedModel in ideasbox models.
http://www.benspaulding.us/weblog/2008/aug/02/auto_now_add-evil/
http://jbisbee.blogspot.fr/2013/07/djangos-datetimefield-autonow-option.html

It's just something that is usually accepted that it's bad practice... I have no hard feelings against it, it's just FYI